torque/examples/leaflet_with_scaling_functions.html

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<html>
<link rel="stylesheet" href="vendor/leaflet.css" />
<style>
#map, html, body {
width: 100%; height: 100%; padding: 0; margin: 0;
}
#title {
position: absolute;
top: 100px;
left: 50px;
color: white;
font-size: 27px;
font-family: Helvetica, sans-serif;
}
</style>
<body>
<div id="map"></div>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script>
<script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script>
<script src="../dist/torque.full.uncompressed.js"></script>
<script>
// define the torque layer style using cartocss
// this creates a kind of density map
//color scale from http://colorbrewer2.org/
var CARTOCSS = [
'Map {',
'-torque-time-attribute: "time";',
'-torque-aggregation-function: "avg(abs(depth));avg(mag)";',
'-torque-frame-count: 200;',
'-torque-animation-duration: 20;',
'-torque-resolution: 1',
'}',
'#all_month_3 {',
' marker-width: "scale_lin(value0,0.0,10,0,5)";',
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' marker-fill-opacity: "scale_sqrt(frame-offset,0,9,1,0)";',
' marker-type: ellipse;',
' marker-fill: "scale_lin(value1,0.1,5,blue,red)";',
'}',
'#all_month_3[frame-offset=1]{}',
'#all_month_3[frame-offset=2]{}',
'#all_month_3[frame-offset=3]{}',
'#all_month_3[frame-offset=4]{}',
'#all_month_3[frame-offset=5]{}',
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'#all_month_3[frame-offset=6]{}',
'#all_month_3[frame-offset=7]{}',
'#all_month_3[frame-offset=8]{}',
'#all_month_3[frame-offset=9]{}',
].join('\n');
var map = new L.Map('map', {
zoomControl: true,
center: [40, 0],
zoom: 3
});
L.tileLayer('http://{s}.api.cartocdn.com/base-dark/{z}/{x}/{y}.png', {
attribution: 'CartoDB'
}).addTo(map);
var torqueLayer = new L.TorqueLayer({
user : 'eschbacher',
table : 'all_month_3',
provider : 'sql_api',
cartocss: CARTOCSS
});
torqueLayer.addTo(map);
torqueLayer.play();
</script>
</body>
</html>